arch/arm/mach-shmobile/headsmp.S

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * SMP support for R-Mobile / SH-Mobile
   4  *
   5  * Copyright (C) 2010  Magnus Damm
   6  * Copyright (C) 2010  Takashi Yoshii
   7  *
   8  * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
   9  */
  10 #include <linux/init.h>
  11 #include <linux/linkage.h>
  12 #include <linux/threads.h>
  13 #include <asm/assembler.h>
  14 #include <asm/memory.h>
  15
  16 #define SCTLR_MMU       0x01
  17 #define BOOTROM_ADDRESS 0xE6340000
  18 #define RWTCSRA_ADDRESS 0xE6020004
  19 #define RWTCSRA_WOVF    0x10
  20
  21 /*
  22  * Reset vector for secondary CPUs.
  23  * This will be mapped at address 0 by SBAR register.
  24  * We need _long_ jump to the physical address.
  25  */
  26         .arm
  27         .align  12
  28 ENTRY(shmobile_boot_vector)
  29         ldr     r1, 1f
  30         bx      r1
  31
  32 ENDPROC(shmobile_boot_vector)
  33
  34         .align  2
  35         .globl  shmobile_boot_fn
  36 shmobile_boot_fn:
  37 1:      .space  4
  38         .globl  shmobile_boot_size
  39 shmobile_boot_size:
  40         .long   . - shmobile_boot_vector
  41
  42 #ifdef CONFIG_ARCH_RCAR_GEN2
  43 /*
  44  * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs.
  45  * This will be mapped at address 0 by SBAR register.
  46  */
  47 ENTRY(shmobile_boot_vector_gen2)
  48         mrc     p15, 0, r0, c0, c0, 5           @ r0 = MPIDR
  49         ldr     r1, shmobile_boot_cpu_gen2
  50         cmp     r0, r1
  51         bne     shmobile_smp_continue_gen2
  52
  53         mrc     p15, 0, r1, c1, c0, 0           @ r1 = SCTLR
  54         and     r0, r1, #SCTLR_MMU
  55         cmp     r0, #SCTLR_MMU
  56         beq     shmobile_smp_continue_gen2
  57
  58         ldr     r0, rwtcsra
  59         mov     r1, #0
  60         ldrb    r1, [r0]
  61         and     r0, r1, #RWTCSRA_WOVF
  62         cmp     r0, #RWTCSRA_WOVF
  63         bne     shmobile_smp_continue_gen2
  64
  65         ldr     r0, bootrom
  66         bx      r0
  67
  68 shmobile_smp_continue_gen2:
  69         ldr     r1, shmobile_boot_fn_gen2
  70         bx      r1
  71
  72 ENDPROC(shmobile_boot_vector_gen2)
  73
  74         .align  4
  75 rwtcsra:
  76         .word   RWTCSRA_ADDRESS
  77 bootrom:
  78         .word   BOOTROM_ADDRESS
  79         .globl  shmobile_boot_cpu_gen2
  80 shmobile_boot_cpu_gen2:
  81         .word   0x00000000
  82
  83         .align  2
  84         .globl  shmobile_boot_fn_gen2
  85 shmobile_boot_fn_gen2:
  86         .space  4
  87         .globl  shmobile_boot_size_gen2
  88 shmobile_boot_size_gen2:
  89         .long   . - shmobile_boot_vector_gen2
  90 #endif /* CONFIG_ARCH_RCAR_GEN2 */
  91
  92 /*
  93  * Per-CPU SMP boot function/argument selection code based on MPIDR
  94  */
  95
  96 ENTRY(shmobile_smp_boot)
  97         mrc     p15, 0, r1, c0, c0, 5           @ r1 = MPIDR
  98         and     r0, r1, #0xffffff               @ MPIDR_HWID_BITMASK
  99                                                 @ r0 = cpu_logical_map() value
 100         mov     r1, #0                          @ r1 = CPU index
 101         adr     r2, 1f
 102         ldmia   r2, {r5, r6, r7}
 103         add     r5, r5, r2                      @ array of per-cpu mpidr values
 104         add     r6, r6, r2                      @ array of per-cpu functions
 105         add     r7, r7, r2                      @ array of per-cpu arguments
 106
 107 shmobile_smp_boot_find_mpidr:
 108         ldr     r8, [r5, r1, lsl #2]
 109         cmp     r8, r0
 110         bne     shmobile_smp_boot_next
 111
 112         ldr     r9, [r6, r1, lsl #2]
 113         cmp     r9, #0
 114         bne     shmobile_smp_boot_found
 115
 116 shmobile_smp_boot_next:
 117         add     r1, r1, #1
 118         cmp     r1, #NR_CPUS
 119         blo     shmobile_smp_boot_find_mpidr
 120
 121         b       shmobile_smp_sleep
 122
 123 shmobile_smp_boot_found:
 124         ldr     r0, [r7, r1, lsl #2]
 125         ret     r9
 126 ENDPROC(shmobile_smp_boot)
 127
 128 ENTRY(shmobile_smp_sleep)
 129         wfi
 130         b       shmobile_smp_boot
 131 ENDPROC(shmobile_smp_sleep)
 132
 133         .align  2
 134 1:      .long   shmobile_smp_mpidr - .
 135         .long   shmobile_smp_fn - 1b
 136         .long   shmobile_smp_arg - 1b
 137
 138         .bss
 139         .globl  shmobile_smp_mpidr
 140 shmobile_smp_mpidr:
 141         .space  NR_CPUS * 4
 142         .globl  shmobile_smp_fn
 143 shmobile_smp_fn:
 144         .space  NR_CPUS * 4
 145         .globl  shmobile_smp_arg
 146 shmobile_smp_arg:
 147         .space  NR_CPUS * 4